hso 4-1:0.0: Failed to find BULK IN ep
general protection fault, probably for non-canonical address 0xdffffc000000000c: 0000 [#1] SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000060-0x0000000000000067]
CPU: 0 PID: 1808 Comm: kworker/0:4 Not tainted 5.6.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usb_hub_wq hub_event
RIP: 0010:cdev_del+0x22/0x90 fs/char_dev.c:593
Code: cf 0f 1f 80 00 00 00 00 55 48 89 fd 48 83 ec 08 e8 33 a5 d2 ff 48 8d 7d 64 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 4f 48
RSP: 0018:ffff8881d4c57248 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: ffff8881d50b7a00 RCX: ffffffff82167c6e
RDX: 000000000000000c RSI: ffffffff816cb7bd RDI: 0000000000000064
RBP: 0000000000000000 R08: ffff8881cdf4b100 R09: fffffbfff1266c8f
R10: fffffbfff1266c8e R11: ffffffff89336477 R12: 0000000000000000
R13: ffff8881d51e9000 R14: ffff8881cd516000 R15: ffff8881cd895070
FS:  0000000000000000(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004c4408 CR3: 0000000007021000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 tty_unregister_device drivers/tty/tty_io.c:3195 [inline]
 tty_unregister_device+0x10d/0x1a0 drivers/tty/tty_io.c:3190
 hso_serial_tty_unregister drivers/net/usb/hso.c:2232 [inline]
 hso_create_bulk_serial_device drivers/net/usb/hso.c:2678 [inline]
 hso_probe.cold+0x6e/0x14c drivers/net/usb/hso.c:2944
 usb_probe_interface+0x310/0x800 drivers/usb/core/driver.c:374
 really_probe+0x290/0xac0 drivers/base/dd.c:551
 driver_probe_device+0x223/0x350 drivers/base/dd.c:724
 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:831
 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:431
 __device_attach+0x217/0x390 drivers/base/dd.c:897
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0x1459/0x1bf0 drivers/base/core.c:2487
 usb_set_configuration+0xe47/0x17d0 drivers/usb/core/message.c:2023
 usb_generic_driver_probe+0x9d/0xe0 drivers/usb/core/generic.c:241
 usb_probe_device+0xd9/0x230 drivers/usb/core/driver.c:272
 really_probe+0x290/0xac0 drivers/base/dd.c:551
 driver_probe_device+0x223/0x350 drivers/base/dd.c:724
 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:831
 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:431
 __device_attach+0x217/0x390 drivers/base/dd.c:897
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0x1459/0x1bf0 drivers/base/core.c:2487
 usb_new_device.cold+0x540/0xcd0 drivers/usb/core/hub.c:2544
 hub_port_connect drivers/usb/core/hub.c:5191 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5331 [inline]
 port_event drivers/usb/core/hub.c:5477 [inline]
 hub_event+0x21cb/0x4300 drivers/usb/core/hub.c:5559
 process_one_work+0x94b/0x1620 kernel/workqueue.c:2264
 worker_thread+0x96/0xe20 kernel/workqueue.c:2410
 kthread+0x318/0x420 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Modules linked in:
---[ end trace f4348a186c62475f ]---
RIP: 0010:cdev_del+0x22/0x90 fs/char_dev.c:593
Code: cf 0f 1f 80 00 00 00 00 55 48 89 fd 48 83 ec 08 e8 33 a5 d2 ff 48 8d 7d 64 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 4f 48
RSP: 0018:ffff8881d4c57248 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: ffff8881d50b7a00 RCX: ffffffff82167c6e
RDX: 000000000000000c RSI: ffffffff816cb7bd RDI: 0000000000000064
RBP: 0000000000000000 R08: ffff8881cdf4b100 R09: fffffbfff1266c8f
R10: fffffbfff1266c8e R11: ffffffff89336477 R12: 0000000000000000
R13: ffff8881d51e9000 R14: ffff8881cd516000 R15: ffff8881cd895070
FS:  0000000000000000(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004c4408 CR3: 0000000007021000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400